Judges have allowed a legal challenge over police practices linked to the shooting of a man whose death sparked nationwide riots.

The decision by three Court of Appeal judges in London yesterday follows a High Court ruling which prevented the mother of Mark Duggan seeking judicial review of guidance intended to stop police officers conferring before giving statements.

Now three Lord Justices have ruled she has an "arguable" case, paving the way for a full hearing. The action brought by Pamela Duggan, whose 29-year-old son died after being shot in Tottenham in 2011, relates to a policy adopted by the Association of Chief Police Officers. At the High Court last June she unsuccessfully argued Acpo's policy lacked measures to reduce the risk that officers involved in a fatal shooting conferred with each other before producing accounts.